Joomla

http://www.joomla.org/

The award-winning Joomla content management system (CMS), is one of the most popular CMSs in the marketplace today allowing users to easily build websites and powerful online applications. Joomla! was most recently voted as Packt Publishing’s “CMS of the Year” 2011.
This powerful system features well over 9300 extensions developed by the Joomla! Community, one of the largest and most enthusiastic open source development communities with over 500,000 community members from around the globe. So finding free community driven support or professional support for your business or organization is easy and affordable. The Joomla! Community also provides comprehensive User Documentation, a